Authors:	S. Fan, R. Baets, A. Petrov, X. Yu, J.D. Joannopoulos, W. Freude, A. Melloni, M. Popovic, M. Vanwolleghem, D. Jalas, M. Eich, M. Krause, H. Renner, E. Brinkmeyer, C. R. Doerr
Title:	Comment on "nonreciprocal light propagation in a silicon photonic circuit"
Format:	International Journal
Publication date:	1/2012
Journal/Conference/Book:	Science
Volume(Issue):	335 p.38b
DOI:	10.1126/science.1216682
Citations:	116 (Dimensions.ai - last update: 21/4/2024) 72 (OpenCitations - last update: 3/5/2024) Look up on Google Scholar
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Abstract

We show that the structure demonstrated by Feng et al. (Reports, 5 August 2011, p. 729)
cannot enable optical isolation because it possesses a symmetric scattering matrix. Moreover,
one cannot construct an optical isolator by incorporating this structure into any system as long
as the system is linear and time-independent and is described by materials with a scalar
dielectric function.